Unloading system.



C. WAINWRIGHT.

UNLOADING SYSTEM.

APPLICATION FILED MAY 2. 1912. RENEWED MAR. 11.1916.

4 SHEETS-SHEET 1- J ll 0 0 a F LL 6 0 0 0 Patented Apr. 18, 1916.

C. WAINWRIGHT.

UNLOADING SYSTEM.

APPLICATION FILED MAY 2. 1912.

RENEWED MAR. H, I916.

Patented Apr. 18, 1916.

w m o 4 SHEETSSHEET 2.

WITNESSES W A TTORNE Y.

C. WAINWRIGHT.

' UNLOADING SYSTEM.

APPLICATION FILED MAYZ. 1912. RENEWED MAR. 1!.1916.

Patented Apr. 18, 1916.

4 SHEETSSHEET 3.

WITNESSES:

C. WAINWRIGHT.

UNLOADING $YSTEM.

APPLICATION FILED MAY 2. I912I RENEWED MAR. II. I916.

I916. SHEET 4'.

Patented Apr. 18

4 SHEETS WITNESSES ATTORNEY.

, 11,-ra ars.

1 an entree arNr orrrnn enhances warnwnrenr, or ERIE, PENNSYLVANIA.

UNLOADING SYSTEM.

Specification of Letters Patent.

Patented Apr. Tn, rare.

Application filed May 2, 1912, Serial No. 694,690. Renewed March 11, 1916. Serial No. 83,690.

To all whom it may concern:

Be it known that 1, CHARLES WAIN- WRIGHT, a citizen of. the United States, re-

siding at Erie, in the county of Erie and State of Pennsylvania, have invented new i and useful Improvements. in Unloading shown in my co-pending applications, Serial 'Numbers 646349 filed August 28, 1911 and 666946 filed December 20, 19111.. The former of these systems consists of a plurality of choking controllers arranged soas to operate successively 'with successive predetermined increasing pressures in the receiver of the compressor to close the intakes of the compressor. With this arrangement a-considerable amount of negatlve work is ,thrown onto the pistons, this negativework resulting from the piston or pistons attenuating the airjentrapped between the controllers and the cylinders as the controllers go into operation. In the latter of the above named applications provision is made for the airentrapped by the going into action of the choking controller to escape into the atmosphere or source of fluid supply. But this system as designed, can only work with a choking controller. Therefore the system i v is in a measure complex. With the present invention, however, the choking controller is eliminated and the interior of the cylinder is placed in communication with the source of fluid supply upon a predetermined ressure 1n the receiver of the compressor. oreover, PI'OVPSIOD is made for balancing the'load on the hlgh and low pressure 1s- ,tons of amultiple stage compressor, w en the invention is used in connection with such a device, as the various unloaders go into operation.

'"Other objects will appear and be better understood from that sembodimgent of the invention of which the followingis a specistage compressor with my invention applied.

fication,reference being had to the accoun panying drawings forming a part hereof, i

and in which:

Figure 1 is a plan view of a multiple thereto. Fig. 2 is a side elevation of 1. Fig. 3 is an'end elevation. Fig. 4L is a vertical cross section taken approximately I on'the line H of Fig. 1. Fig. 5 is a dia grammatic View of the invention. Fig. 6 1s a detail horizontal section showing the unloader in applied position. Fi 7 is a detail section on the line 77 0% Fig. 6.

In the drawings and especially in Figs. 1 to 3 inclusive, a indicates generally the compressor which is of the double acting multiple stage "type. The pistons (not shown) in the low pressure cylinders b and high pressure cylinder are suitably connected to amotor 01 of any preferred type adapted for operating the said pistons. An inter-cooler e is suitably connected such as by pipes f-f to the high and low pressure cylinders c and b betweenwhich it is herein shown as interposed. The high pressure side of the compressor rests upon a base 9 and a suitable base it forms a bed for the low pressure side and the intake box The foregoing is descriptive of a well known type of compressor and it must be understood that in the application of my invention about to be'described, I do not intend to limit myself to a compressor wherein the parts are disposed as previously described or a compressor of the type set forth.

The opposite ends of each of the cylinders .b and 0 have lateral ports 5 arranged adjacent to the'heads of the cylinders as shown indetail in Fig. 6. In each of such ports is fitted, as shown in Fig. 6, a valve seat in the form of a spider 8 which is adapted for guiding the stem 9 fitted at one end with a valve 10 which controls'the port 5. The casing 11 which is suitably connected with the valve seat is apertured as at 12.12 to permit the air to pass to the. source of supply when the valve is unseated.

Since the underlying principle of my invention resides in placing the interior of the cylinder in communication with the source of fluid supply upon a predetermined pressure in the receiver of the compressor, it matters little in so far as the broad principle is concerned whether the air passes directly into the atmosphere or is suitably conve ed to any desired. art of the compressor. or the purpose of ture however, in point .of noiselessness, ll

refining the strucform each cylinder with a chamber 13 e 'xtending substantially to the length of the cylinder and communicating through a nipple 14 with the intake 'box 21. The upper portion of this chamber is, as shown in Fig.

6, tapped near one end to receive the casing bolts or other fastening elements may be passed, when the flange is apertured, to se cure the casing to the cylinder. A cap or bonnet 16 is suitably fastened to the outer end of the casing 11 and has a guide 17 for the rod l8.which carries at its inner end a.

plunger 19. The valve stem 9 has a reduced portion 20 that passes through an axial bore in the rod 18 and plunger 19 and which is held against displacement by a nut 21 and the shoulder 22. A spring 23 is employed for holding the valve 10 to its seat and the plunger 19 clear of a lateral port in the :asing 8 which receives one end of a pipe 24. The outer face of the plunger 19 has a groove 25 which increases the volume or space between the bonnet and the outer face of the plunger so that the compressed fluid entering the space will more readily act on the plunger.

Referring now to Fig. 5 the header 26 connects with any suitable point in the receiver (not shown) of the compressor and extends along the low pressure side of the compressor and connects by branch pipes 27-27 to a series of controllers 28 of any desired type."'The controllers are so disposed and connected to the unloaders as to bring about the unloading of two alternate ends of the low pressure cylinders successively and to effect the" unloading of the other two ends of-the said cylinders successively and synchronous'ly with the unloading of the high pressure cylinder.

"With the parts arranged as shown in Fig. 5, andeachcontroller adjusted so as to operate witha-receiver'pressure different from the receiver pressure which operates any other. controller the unloading of the compressor'may'be effectedas above indicated. For instance, 'the'controller marked k operateswitli the" least amount of container ressureprevieusly determined upon, then when'such'pressure -has 'been obtained in the pipe 27*and chamber 29in Fig. 6, the plunger- 30 'wi1l move outwardly and unseat the eedle- 'V'a'lveB he eoinpressed fluid will now enteffth pipe{- 24*"a-nd the chamber afforded by"theygrooye*25 and cap16. Inasm'ueh asthe gsp1 ing 23 is" relatively weak,

h rungewwiu' be nfovedi-nwardly by the pr jure" lieflbhafifib' nd'ca'rry the valve 0 th counterbo ortion 32 of the 'lllius 'tlie air 'd wn into the cylino, ier by the' piston on its suction stroke, will,

upon the compression stroke of the iston, be dlscharged through the port 5. With the second controller marked m adjusted to operate with a container pressure difi'erent from that which operated the controller 70, then upon the going into operation of the controller m the opposite end of the cylinder will be unloaded and at the same time and by virtue of a pipe connection 33 between the controller m and the unloader in one end of the high pressure cylinder, the said end of the high pressure cylinder will be unloaded synchronously with the unloading of the low pressure cylinder. This construction establishes equilibrium in the high and low pressurepistons which are active after the unloading of one of the low pressure cylinders.

The going into action of the controller marked n effects the unloading of one end of the second low pressure cylinder and when the highest predetermined pressure operates the controller 0 the complete unloading of the compressor is obtained since the last unloader which goes into operation on the low pressure side of the compressor is connected with the controller 0 and the other unloader of the high pressure cylinder by a pipe 34.

What I claim as new is,- 1. A plural stage fluid compressor comprising a trinity of compressor cylinders in one of which the final stage of high compression takes place, in two compression chambers and in the others the initial stage of low compression takes place in four compression chambers, means for effecting compression in the compression chambers of the cylinders, an unloading valve located in each compression chamber of each cylinder, a fluid pressure passage way connecting one unloading valve of one cylinder of initial compression with one unloading valve of the cylinder of final compression, a fluid pressure passage way connecting one unloading valve of the other cylinder of initial compressionwith the other unloading valve of the cylinder of final compression, pressure operated valves connected one with each of the unloading valves of the cylinders of initial compression for controlling the passage of fluid pressure to the unloading valves, and means for supplying fluid pressure to all of the pressure operated valves from a single source.

2. A plural stage fluid compressor comprising a trinity of compressorcylinders in one of which the final stage of high com pression takes place in two compression chambers and in the others the initial stage of low compression takesplace in four compression chambers, means for efi'ecting compression 1n the compression chambers ofthe cyl1nders,,an, unloading valve located 1n each compression chamber of each cylinder,

compression, a fluid pressure passage Wey eeimeesimg ene em leading Valve 05 the other eyiinder eff imieiei eempressien Wim the ether iii'iieediing veive ef the eyiiiuier ef fine eempieesien, pifeesiii'e epemte valves eenneei'ieii ene with each of the unloading; velves ef the cyliiv ders 0f initial cempreesioii eembi'elf the pessege 0i uid pressure i iiieedg wives pressure epemtesi "we ing; adjusted fie epemifie eiififereiii; 'eimes end. whee siw' single s nice,

3., A plum sege fluid. eeiiipi'essei eem-. sing e, of ee-mpressei' cylinders iii ene 01? which the fine-E of high cempressien tak piece in ewe cempressien chambers and the ethers the in". mi siege of leW eempressien takes piece in four eempression chambers, means for effecting eempression in the eempressien'. chambers 055 the cylinders an unloading Veive leceeee'i in each eempressien chamber ef each eyiieier,

e flui 1 pressure pessege Wey eeimeeiaiiig else 25 unleediing; "valve ef me @171 ier e1? inieiei eempressien with we unieedmg "waive the cylinder of finei eempicessiem pressure passage Way connecting one loading "waive ef the other cyiindier e1? is tied eempi'essieii with the ethei? unieeti Valve the eyiii'ider 02E final eempreseieii pressure epemieei valves ee iieeiedixeme "Wi each of iahe unieeeiing i "elves e1? she evf" 65ers 02% initial eenipre ehepassege 01f 19.. M ing "valves seiei pressuie epere edE veivee ing adjusted 70 e eei'etesueeeeeiveiy m 1 subjeciieci to fluid pressure which inerees in the degree ef eempressien, and means fer W supplying :fiiuid pressure to eii e]? the pressure operated valves from a single source" In i'zessbimeny Whereeif 1 have effixedi my signature in presence 01" W 0 Witnesses CHARLES WVAJIEWVRIGHT Witnesses FL Q12 Gemmm 

